FDA warns of fake Botox

A New York dermatologist administers Botox to a patient last month. (Mike Seger/Reuters)

An alert posted on the Food and Drug Administration website Friday warns consumers that counterfeit versions of Botox are being sold in U.S.

The drug, made by Allergan Inc., is used to treat wrinkles, headaches and other conditions.

"FDA cannot confirm that the manufacture, quality, storage, and handling of these products follow U.S. standards," the agency said of the foreign-made drug.

Allergan said that in addition to violating federal law, products that are illegally imported may be counterfeit or compromised.

"Therefore, health care professionals purchasing products from a non-Allergan supplier are purchasing products that are fraudulently diverted and sold through unauthorized channels," the company said in a statement.